Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold

Takeshi Fujita, Tomoharu Tokunaga, Ling Zhang, Dongwei Li, Luyang Chen, Shigeo Arai, Yuta Yamamoto, Akihiko Hirata, Nobuo Tanaka, Yi Ding, Mingwei Chen

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.

Original languageEnglish
Pages (from-to)1172-1177
Number of pages6
JournalNano Letters
Volume14
Issue number3
DOIs
Publication statusPublished - 2014 Mar 12
Externally publishedYes

Fingerprint

Nanopores
Coarsening
Gold
Catalysis
catalysis
chemical reactions
gold
catalysts
Chemical reactions
atoms
catalytic activity
Surface segregation
Atoms
Catalysts
Catalytic oxidation
Carbon Monoxide
oxidation
Catalyst activity
defects
Metals

Keywords

  • CO oxidation
  • environmental transmission electron microscopy
  • heterogeneous catalyst
  • In situ TEM
  • nanoporous metal

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Fujita, T., Tokunaga, T., Zhang, L., Li, D., Chen, L., Arai, S., ... Chen, M. (2014). Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. Nano Letters, 14(3), 1172-1177. https://doi.org/10.1021/nl403895s

Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. / Fujita, Takeshi; Tokunaga, Tomoharu; Zhang, Ling; Li, Dongwei; Chen, Luyang; Arai, Shigeo; Yamamoto, Yuta; Hirata, Akihiko; Tanaka, Nobuo; Ding, Yi; Chen, Mingwei.

In: Nano Letters, Vol. 14, No. 3, 12.03.2014, p. 1172-1177.

Research output: Contribution to journalArticle

Fujita, T, Tokunaga, T, Zhang, L, Li, D, Chen, L, Arai, S, Yamamoto, Y, Hirata, A, Tanaka, N, Ding, Y & Chen, M 2014, 'Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold', Nano Letters, vol. 14, no. 3, pp. 1172-1177. https://doi.org/10.1021/nl403895s
Fujita T, Tokunaga T, Zhang L, Li D, Chen L, Arai S et al. Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. Nano Letters. 2014 Mar 12;14(3):1172-1177. https://doi.org/10.1021/nl403895s
Fujita, Takeshi ; Tokunaga, Tomoharu ; Zhang, Ling ; Li, Dongwei ; Chen, Luyang ; Arai, Shigeo ; Yamamoto, Yuta ; Hirata, Akihiko ; Tanaka, Nobuo ; Ding, Yi ; Chen, Mingwei. / Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. In: Nano Letters. 2014 ; Vol. 14, No. 3. pp. 1172-1177.
@article{b6266968bdca46e48189b6a1f5fca7df,
title = "Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold",
abstract = "Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.",
keywords = "CO oxidation, environmental transmission electron microscopy, heterogeneous catalyst, In situ TEM, nanoporous metal",
author = "Takeshi Fujita and Tomoharu Tokunaga and Ling Zhang and Dongwei Li and Luyang Chen and Shigeo Arai and Yuta Yamamoto and Akihiko Hirata and Nobuo Tanaka and Yi Ding and Mingwei Chen",
year = "2014",
month = "3",
day = "12",
doi = "10.1021/nl403895s",
language = "English",
volume = "14",
pages = "1172--1177",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "3",

}

TY - JOUR

T1 - Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold

AU - Fujita, Takeshi

AU - Tokunaga, Tomoharu

AU - Zhang, Ling

AU - Li, Dongwei

AU - Chen, Luyang

AU - Arai, Shigeo

AU - Yamamoto, Yuta

AU - Hirata, Akihiko

AU - Tanaka, Nobuo

AU - Ding, Yi

AU - Chen, Mingwei

PY - 2014/3/12

Y1 - 2014/3/12

N2 - Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.

AB - Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.

KW - CO oxidation

KW - environmental transmission electron microscopy

KW - heterogeneous catalyst

KW - In situ TEM

KW - nanoporous metal

UR - http://www.scopus.com/inward/record.url?scp=84896364367&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84896364367&partnerID=8YFLogxK

U2 - 10.1021/nl403895s

DO - 10.1021/nl403895s

M3 - Article

AN - SCOPUS:84896364367

VL - 14

SP - 1172

EP - 1177

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

IS - 3

ER -